A kind of two-dimensional bismuth nanocomposite material and its preparation method and application
A composite material, bismuth nanotechnology, applied in the direction of bismuth compounds, nanotechnology, nanotechnology, etc., can solve the problems of restricting the application of two-dimensional nanomaterials, poor near-infrared light absorption, low material stability, etc., and achieve excellent brain targeting Performance and dual-modal imaging capabilities, good near-infrared light absorption, and increased photostability
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[0029] The present invention also provides a method for preparing the two-dimensional bismuth nanocomposite material described in the above technical solution, comprising the following steps:
[0030] 1) mixing the bismuth powder with the stripping solvent, and grinding to obtain a bismuth powder particle solution;
[0031] 2) The bismuth powder particle solution obtained in step 1) is subjected to probe ultrasonic peeling treatment under ice bath conditions, the first centrifugation is performed, and the supernatant is collected to obtain an ultra-thin bismuth nanosheet solution, and the second centrifugation is performed to collect the precipitate to obtain Bismuth nano flakes are added with water to obtain bismuth nano flakes solution, which is freeze-dried to obtain bismuth nano flakes powder;
[0032] 3) Place the bismuth nanoflake powder obtained in step 2) in an atomic deposition device, and introduce the precursors of ozone and platinum; the method of introduction incl...
Embodiment 1
[0044] (1) Preliminary physical grinding: Mix the bismuth powder passed through a 200-mesh sieve with nitrogen methyl pyrrolidone solvent, place it under a ball mill and grind it for 1 hour to obtain a solution of bismuth powder particles (above micron) with a smaller particle size. Bismuth powder in the solution The concentration in is 50mg / mL).
[0045] (2) Secondary liquid-phase exfoliation: Take 1.6 mL of the above-mentioned preliminary ground bismuth powder particle solution, place it in a cell pulverizer, and perform probe ultrasonic (power: 500W) exfoliation treatment for 15 hours in an ice-water environment. The resulting solution is then subjected to low-speed centrifugation (2000rpm, 5 minutes) to remove bulky impurities, and the ultra-thin bismuth nanosheet solution of the supernatant is collected, and then the resulting supernatant is further subjected to high-speed centrifugation (7000rpm, 30 minutes), and the bottom is collected. Precipitation is bismuth nano fla...
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